6.3
Boilers in c one underfloor heating c one direct c one domestic hot water
tank
6.3.1
Hydraulic connection
Fig.57
Boilers in c 1 underfloor heating c 1 direct c 1 domestic hot water tank
MW-3000020-05
T
30
38
38
31
124
9
16
24
25
T
T
S
9
9
123
27
26
33
44
61
9
9
93
2
35
30e
27
27
9
117
27
34
27
34
65
64
7
3
7
18
27
9
3
T
2 Heating pump direct circuit
3 6 bar (0.6 MPa) safety valve
7 Automatic air vent
9 Isolation valve
16 Closed expansion vessel
18 Heating circuit fill point
(France: with disconnector according to prevailing
regulations)
24 Domestic hot water tank exchanger primary inlet
25 Domestic hot water tank exchanger primary outlet
26 DHW booster pump
27 Non-return valve
30 Calibrated and sealed safety unit
France: (7 bar (0.7 MPa) - with opening on the
discharge pipe)
30e Drain valve
31 Independent domestic hot water tank
33 Domestic hot water temperature sensor
34 Modulating boiler pump
35 Low-loss header
38 Remote control with or without room temperature
sensor
44
France: 65 °C safety thermostat with manual reset
for underfloor heating (DTU 65.8, NF P52-303-1)
Austria: safety device to safeguard against
overheating: according to the type of underfloor
heating
Other countries: safety device to safeguard
against overheating of the underfloor heating, in
accordance with prevailing regulations
61 Thermometer
64 Direct heating circuit (example: radiators)
65 Heating circuit with mixing valve, may be low
temperature heating circuit (underfloor heating or
radiators)
93 Heating pump for underfloor heating circuit
117 Three-way mixing valve
123 Cascade return sensor
124 Cascade flow sensor
6 Connecting diagrams and configuration
50
7702639 - v03 - 10072018
